#pragma once

#include <iostream>
#include <string>
#include <queue>
#include <vector>
#include <memory>
#include "Log.hpp"
#include "Mutex.hpp"
#include "Cond.hpp"
#include "Thread.hpp"

namespace ThreadPoolModule
{
    using namespace LogModule;
    using namespace ThreadModule;
    using namespace LockModule;
    using namespace CondModule;
    void DefaultTest()
    {
        while(true)
        {
            LOG(LogLevel::DEBUG)<<"我是一个测试方法";
            sleep(1);
        }
    }

    using thread_t = std::shared_ptr<Thread>;

    const static int defaultnum = 5;

    template<class T>
    class ThreadPool
    {
    private:
        bool IsEmpty()
        {
            return _taskq.empty();
        }
        void HandlerTask(std::string name)
        {
            LOG(LogLevel::INFO)<<"线程: "<<name<<",进入HandlerTask的逻辑";
            while(true)
            {
                T t;
                {
                    LockGuard lockguard(_lock);
                    while(IsEmpty()&&_isrunning)
                    {
                        _wait_num++;
                        _cond.Wait(_lock);
                        _wait_num--;
                    }

                    if(IsEmpty()&&!_isrunning)
                        break;
                    t = _taskq.front();
                    _taskq.pop();
                }
                t(name);
            }
            LOG(LogLevel::INFO)<<"线程: "<<name<<"退出";
        }

        ThreadPool(const ThreadPool<T>& ) = delete;
        ThreadPool<T>& operator=(const ThreadPool<T>& )=delete;
        ThreadPool(int num = defaultnum):_num(num),_wait_num(0),_isrunning(false)
        {
            for(int i = 0;i<_num;i++)
            {
                _threads.push_back(std::make_shared<Thread>(std::bind(&ThreadPool::HandlerTask,this,std::placeholders::_1)));
                LOG(LogLevel::INFO)<<"构建线程"<<_threads.back()->Name()<<"对象...成功";
            }
        }
    public:
        static ThreadPool<T>* getInstance()
        {
            if(instance==NULL)
                LockGuard lockguard(mutex);

                if(instance==NULL)
                {
                    LOG(LogLevel::INFO)<<"单例首次被执行,需要加载对象...";
                    instance = new ThreadPool<T>();
                }
            return instance;
        }

        void Equeue(T&& in)
        {
            LockGuard lockguard(_lock);
            if(!_isrunning)
                return;
            _taskq.push(std::move(in));
            if(_wait_num>0)
                _cond.Notify();
        }
        void Start()
        {
            if(_isrunning)
                return;
            _isrunning = true;
            for(auto& thread_ptr:_threads)
            {
                LOG(LogLevel::INFO)<<"启动线程"<<thread_ptr->Name()<<"...成功";
                thread_ptr->Start();
            }
        }
        void Wait()
        {
            for (auto &thread_ptr : _threads)
            {
                thread_ptr->Join();
                LOG(LogLevel::INFO) << "回收线程" << thread_ptr->Name() << " ... 成功";
            }
        }
        void Stop()
        {
            LockGuard lockguard(_lock);
            if(_isrunning)
            {
                _isrunning = false;
                if(_wait_num>0)
                    _cond.NotifyAll();
            }
        }
        ~ThreadPool()
        {

        }
    private:
        std::vector<thread_t> _threads;
        int _num;
        int _wait_num;
        std::queue<T> _taskq;//临界资源

        Mutex _lock;
        Cond _cond;
        bool _isrunning;

        static ThreadPool<T>* instance;
        static Mutex mutex;//只是用来保护单例
    };
    template<typename T>
    ThreadPool<T> *ThreadPool<T>::instance = NULL;
    template<typename T>
    Mutex ThreadPool<T>::mutex; //只用来保护单例
}